Digging deep

When I first started out on this UBBT journey with Master Brinker and the other black belts I knew there would be things that would be expected of me that would not be easy. I picked things off of the list that I felt "spoke" to me. But there was one requirement that did bother me that I did not pick. It has been playing on my mind since October when I first started the challenge.
"Mend two relationships in your life that have gone bad. This doesn't have to be your fault but you have to be big enough to fix it."
This is not the exact wording, but you get the picture. Without acknowledging or making this choice openly I guess I did pick it subconsciously.
So the other person in this broken relationship is beyond fixing anything. She is in her declining years and whether she knows it or not, does not have her full facilities.
I avoid her constantly, will not answer the phone if her number shows up,and to make matters worse never had a good thing to say to her or about her. So the battle rages within me, back and forth, was it me or is she to blame. Finally two weeks ago I answered the phone when I knew it was her. I managed to swallow my anger and talk civilized to her. I realized I will never be able to talk to her about what went wrong, but in the end forgiveness is what will set me free of this corrosive relationship. I have to forgive her for getting old on me and I have to forgive myself for resenting it.
This will be an ongoing process. It gets easier each time I talk to her. I have been trying to start a new friendship. Ieave the old one behind with the person she can no longer be. Heaven help me because it is still very hard not to reverse back to how I felt before.
With this all going on another relationship came to mind and so I will throw this one around in my head for a while and decide how I can fix it. I know this one is only my fault. So hopefully I can find the inner strength to be a bigger person.